On the night on which he was betrayed, our Lord knew he would die the next day. He knew that before that happened he would be betrayed (and by whom) and denied (and by whom). He knew he would be abandoned, mocked, scorned, slapped, punched, and scourged. He knew he who was sinless would take on himself all the sins of all of us.
How would you spend your last night if you knew it would be your last night? He chose to wash the feet of his disciples. He gave bread and wine, his body and blood, and forgiveness. He gave the promise of a Comforter, the Holy Spirit. He gave a command to love one another.
Holy communion always brings us close to Christ, but never closer than on Maundy Thursday, when we are aware of that night and what he did and what he said and what he faced for us. It was profound sorrow and pure joy to be in his presence on this night of all nights.